Overview

• OpenAI released GPT-5 on August 7 as the default model for all ChatGPT tiers and API users, featuring an intelligent router that shifts automatically between efficient and deep-reasoning engines.
• Developers can choose from three GPT-5 API variants—GPT-5, GPT-5 Mini and GPT-5 Nano—each tailored to balance compute demands and performance needs.
• Free-tier users access full GPT-5 until they reach usage caps and then switch to GPT-5 Mini, while Plus, Pro and Enterprise subscribers retain uninterrupted access to the primary model.
• A new safe completions mechanism aims to reduce outright refusals and hallucinations by offering measured responses, and OpenAI will deprecate all prior GPT versions by early October.
• xAI’s Grok 4 currently outperforms GPT-5 on the Arc-AGI2 benchmark, and Elon Musk has confirmed that Grok 5 is expected before the end of 2025.